Barcelona appointed Hansi Flick as coach Wednesday on a deal until June 30, 2026, after sacking Xavi Hernandez last week.
"Barca and Flick have reached an agreement for the German to become men's first team football coach until June 30, 2026," said the club in a statement.
"The new coach has signed a contract at the club's offices accompanied by FC Barcelona president Joan Laporta."
Flick, who led German giants Bayern Munich to a historic sextuple in 2020, became the first coach ever to be sacked by the German national team in September 2023 after a string of bad results.
The 59-year old occasionally watched Barca matches this season from the presidential box and was linked with the job after Xavi said in January he would depart at the end of the campaign.
Barca and Xavi decided jointly he would stay for next season after all in April but then Laporta changed his mind and sacked the former midfield great last week.
"It won't be easy at all - they will suffer and they will need patience because it's a really difficult job," Xavi warned his successor last week after winning his final match in charge against Sevilla in LaLiga.
"The only thing that can save them is winning, whether they have been part of the club or not."
Barca finished second in LaLiga this season and were knocked out of the Champions League in the quarter-finals by Paris Saint-Germain.
Spanish media said Laporta was enraged by Xavi's comments earlier in May when he highlighted the economic difficulties Barca had when competing against Spanish champions Real Madrid and other European elite.